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Old 02-03-2007, 01:00 AM   #1
skubydew16
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Default my subie is backfiring and don't know why

i have a 06 subie sti..and lately it has been backfiring..not really bad but it seems like every time i take it to about 5k rpm it backfires a little. not very loud but still irritating. just to let u know...in case it will help...i have a hks exaust with a hks downpipe..i also have a intake and bov..i really hope you guys can help me out it is really irritating to me.....

p.s. i just put the downpipe on a week ago and it did not do it before then.
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Old 02-03-2007, 02:00 AM   #2
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ur running rich, theres plenty of threads on this
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Old 02-03-2007, 05:14 AM   #3
06grayrex
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Quote:
Originally Posted by skubydew16 View Post
i have a 06 subie sti..and lately it has been backfiring..not really bad but it seems like every time i take it to about 5k rpm it backfires a little. not very loud but still irritating. just to let u know...in case it will help...i have a hks exaust with a hks downpipe..i also have a intake and bov..i really hope you guys can help me out it is really irritating to me.....

p.s. i just put the downpipe on a week ago and it did not do it before then.
A lot of people say that using an aftermarket bov will cause you to run rich, unless you are tuned for it. I would stick the stock bov back on. Do you have a catted dp?
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Old 02-03-2007, 09:18 PM   #4
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A lot of people say that using an aftermarket bov will cause you to run rich, unless you are tuned for it. I would stick the stock bov back on. Do you have a catted dp?

yeah but you know what, i was backfiring quite a bit, and that was on a stock BPV, and now that I out on a BOV, its still the same..not louder or more frequent...just the same. so I honestly doubt its the BOV, I think people around here made that up cause of their hate for BOV's cause some think they are rice.
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Old 02-04-2007, 01:19 AM   #5
skubydew16
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yea, but it only has one cat as opposed to the stock two.
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Old 02-05-2007, 04:43 PM   #6
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so maybe go back to the stock two and see if that diagnoses your problem..
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Old 02-05-2007, 09:45 PM   #7
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U r backfiring because u dont have cats no more. The bov tends to make u backfire.aftermarket BOV are bad for our cars unless running a lot boost.

get tuned and all ur problems will stop
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Old 02-06-2007, 07:40 AM   #8
MYnewWRX
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U r backfiring because u dont have cats no more. The bov tends to make u backfire.aftermarket BOV are bad for our cars unless running a lot boost.

get tuned and all ur problems will stop

with an Accesport or at a shop ? and what are they tuning ?
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Old 02-06-2007, 08:55 AM   #9
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yeah but you know what, i was backfiring quite a bit, and that was on a stock BPV, and now that I out on a BOV, its still the same..not louder or more frequent...just the same. so I honestly doubt its the BOV, I think people around here made that up cause of their hate for BOV's cause some think they are rice.

i'd like to have one... but i also understand how a MAF based system works. ever ounce of air is accounted for, and fuel is added accordingly. an atmospheric BOV is tossing away some of that air, so it is pretty obvious there is going to be more fuel then needed. not only will you get afterfires (not backfires!!), but it will also screw up your fuel trims. the ecu will see it too rich and pull back some fuel to adjust.
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Old 02-06-2007, 01:14 PM   #10
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the AP is great if you've got the money. i would do that but i'll tell u this much, i've got the AP and im rnning a stg2 91 map (usually run 93 but can't find good gas in kansas at school) and i still get "afterfires, or backfires" idk the correct way of saying it cuz im not a pro but it will help for sure
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Old 02-06-2007, 05:10 PM   #11
MYnewWRX
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so is there anything at all that will stop the backfires ?
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Old 02-06-2007, 05:20 PM   #12
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put your stock cats back in and get rid of the BOV and Intake.
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Old 02-06-2007, 06:04 PM   #13
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A exhaust leak can cause backfire, any air introduced into the system on decel will light off the unburned fuel. I had a occ. backfire on decel, and found a pinhole in one of my welds. fixed the weld now no backfire.
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Old 02-06-2007, 06:08 PM   #14
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A exhaust leak can cause backfire, any air introduced into the system on decel will light off the unburned fuel. I had a occ. backfire on decel, and found a pinhole in one of my welds. fixed the weld now no backfire.
Are you talking about afterfire? My Borla will give a slight pop occasionally during deceleration and I wonder if the clamps are torqued properly...
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Old 02-07-2007, 10:33 AM   #15
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Yea, afterfire-backfire, proper term. is afterfire. Mine will still pop on a hard shift every now and then, but never on decel. anymore.
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Old 02-11-2007, 02:36 PM   #16
skubydew16
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ok...soo... is there any way to get rid of the (afterfiring) without going to the stock parts..the reason we all go to aftermarket parts is to produce gains in power so obviously we dont want to loose that. i appreciate the help everyone is giving though. keep it coming guys...
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Old 02-11-2007, 02:37 PM   #17
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all STi's do this..they run rich and with aftermarket parts it will only get worse.

i would put on your stock BPV to get rid of the BOV, and the factory airbox like some have mentioned.
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Old 02-11-2007, 02:43 PM   #18
skubydew16
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i have already put the stock airbox in and that helped. still does it though....by the way i appoligize but i have not been in the forum very long...what is a bpv?
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Old 02-11-2007, 02:54 PM   #19
anthonywrx
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Originally Posted by skubydew16 View Post
i have already put the stock airbox in and that helped. still does it though....by the way i appoligize but i have not been in the forum very long...what is a bpv?
the BPV (bypass valve) is our factory part on the intercooler where you had your blow off valve. again, you can't really do too much do to the fact that the STi runs rich. once you start taking off your cats, then it just gets worse.
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Old 02-13-2007, 06:40 PM   #20
AphexDouble
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I have an 04 WRX with a Blitz Nur Spec, and a TurboXS up and down pipe, and an HKS BOV - my car is running more lean than rich... Is that basically the same reason why?
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